but if i use chan= rayleighchan(Ts,fd,tau,pdb); it creates a channel 'object' not 'coeff vector', but i need to find the 'coefficient vector' of this channel what i basically need to input to mlseeq function.

You can use the filter method of this object to pass your signals through
the channel. In a script, it will look like this:

% Transmitted signal
x = myTransmitter();

% Simulate channel
r = filter(h, x);

At this point, the PathGains property of the channel object, h, contains the
channel coefficients used:

chCoeffs = h.PathGains;

You can use chCoeffs in the MLSE equalizer.

Note that the defualt channel has only one path. For an MLSE simulation you
will probably need to configure the channel object as a multipath channel.
You can get more details from the documentation. Try typing "doc
rayleighchan" in the comman prompt. Also, read the "Fading Channels"
section of the Communications Toolbox Users Guide.

Hth,
Ethem

"mahmud_dbm " <mahmud_dbm@yahoo.com> wrote in message
news:hdosn9$9h0$1@fred.mathworks.com...
> dear sir,
>
> 1.
> i'm facing a problem and i hope u can help me out as i've seen you
> previous posts in the related field.
>
> i'm using matlab built in function mlseeq(x,chcffs,const,tblen,opmode)
> function.
> (Equalize linearly modulated signal using Viterbi algorithm)
>
> where "chcffs " is channel coefficient 'vector'
>
> but if i use chan= rayleighchan(Ts,fd,tau,pdb); it creates a channel
> 'object' not 'coeff vector', but i need to find the 'coefficient vector'
> of this channel what i basically need to input to mlseeq function.
>
> please give me any solution fot this.

I've read your message and i've tried to do exactly what you've said.
But i get bad results (BER around 0.5). And what is strange, if i remove the equalization, i get better results than with equalization.
The following code is the example that i've used:

Have you fixed the problem? I am using mlseeq but I am generating the Rayleigh fading channel using randn function. The problem I am facing is that, the performance of the mlsseq is worse than the MSE equalizer. I can provide the code I have.

but i still have a problem with the result for CDMA system >> i got a very good result

so if u want i can read your code and try to fix your problem and i will used see if i can used it.

my email is >> eng_ammar_1988@yahoo.com

"Saed" wrote in message <jgp3ha$2ii$1@newscl01ah.mathworks.com>...
> Hi,
>
> Have you fixed the problem? I am using mlseeq but I am generating the Rayleigh fading channel using randn function. The problem I am facing is that, the performance of the mlsseq is worse than the MSE equalizer. I can provide the code I have.
>
> Thanks
> "Aurele Marc" wrote in message <hf2rqd$n5j$1@fred.mathworks.com>...
results ? Is there any problem with the call of mlseeq function in the code ?

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